Thanks much for your advise. We do a have full trek (12 people) and only 2 boys have solo tents, they have used them on other backpacking trips we have taken so they didn't buy them specifically for Philmont.... I also have one female adult leader going and her son doesn't want to sleep with her so she will be taking a small tent.
Personally I wouldn't buy one of the really small tents because for bit more you can buy a small 2 person (which is what my son and I have) and then he can use it solo if he wants to in the future.
Thanks again, I can't wait to go....